diff --git a/Chart.cabal b/Chart.cabal
--- a/Chart.cabal
+++ b/Chart.cabal
@@ -1,5 +1,5 @@
 Name: Chart
-Version: 1.9.3
+Version: 1.9.4
 License: BSD3
 License-file: LICENSE
 Copyright: Tim Docker, 2006-2014
@@ -14,14 +14,15 @@
 
              Documentation: https://github.com/timbod7/haskell-chart/wiki.
 Category: Graphics
-Cabal-Version: >= 1.6
+Cabal-Version: 1.18
 Build-Type: Simple
 
 library
+  default-language: Haskell98
   Build-depends: base >= 3 && < 5
                , old-locale
                , time, mtl, array
-               , lens >= 3.9 && < 4.19
+               , lens >= 3.9 && < 5.2
                , colour >= 2.2.1 && < 2.4
                , data-default-class < 0.2
                , mtl >= 2.0 && < 2.3
diff --git a/Graphics/Rendering/Chart/Axis/Int.hs b/Graphics/Rendering/Chart/Axis/Int.hs
--- a/Graphics/Rendering/Chart/Axis/Int.hs
+++ b/Graphics/Rendering/Chart/Axis/Int.hs
@@ -14,11 +14,58 @@
 ) where
 
 import Data.List(genericLength)
+import Data.Int (Int8, Int16, Int32, Int64)
+import Data.Word (Word8, Word16, Word32, Word64)
 import Graphics.Rendering.Chart.Geometry
 import Graphics.Rendering.Chart.Axis.Types
 import Graphics.Rendering.Chart.Axis.Floating
 
 instance PlotValue Int where
+    toValue    = fromIntegral
+    fromValue  = round
+    autoAxis   = autoScaledIntAxis defaultIntAxis
+
+instance PlotValue Int8 where
+    toValue    = fromIntegral
+    fromValue  = round
+    autoAxis   = autoScaledIntAxis defaultIntAxis
+
+instance PlotValue Int16 where
+    toValue    = fromIntegral
+    fromValue  = round
+    autoAxis   = autoScaledIntAxis defaultIntAxis
+
+instance PlotValue Int32 where
+    toValue    = fromIntegral
+    fromValue  = round
+    autoAxis   = autoScaledIntAxis defaultIntAxis
+
+instance PlotValue Int64 where
+    toValue    = fromIntegral
+    fromValue  = round
+    autoAxis   = autoScaledIntAxis defaultIntAxis
+
+instance PlotValue Word where
+    toValue    = fromIntegral
+    fromValue  = round
+    autoAxis   = autoScaledIntAxis defaultIntAxis
+
+instance PlotValue Word8 where
+    toValue    = fromIntegral
+    fromValue  = round
+    autoAxis   = autoScaledIntAxis defaultIntAxis
+
+instance PlotValue Word16 where
+    toValue    = fromIntegral
+    fromValue  = round
+    autoAxis   = autoScaledIntAxis defaultIntAxis
+
+instance PlotValue Word32 where
+    toValue    = fromIntegral
+    fromValue  = round
+    autoAxis   = autoScaledIntAxis defaultIntAxis
+
+instance PlotValue Word64 where
     toValue    = fromIntegral
     fromValue  = round
     autoAxis   = autoScaledIntAxis defaultIntAxis
diff --git a/Graphics/Rendering/Chart/Plot/Histogram.hs b/Graphics/Rendering/Chart/Plot/Histogram.hs
--- a/Graphics/Rendering/Chart/Plot/Histogram.hs
+++ b/Graphics/Rendering/Chart/Plot/Histogram.hs
@@ -7,6 +7,7 @@
   , defaultPlotHist
   , defaultFloatPlotHist
   , defaultNormedPlotHist
+  , histToBins
     -- * Accessors
   , plot_hist_title
   , plot_hist_bins
@@ -161,6 +162,7 @@
         let y = (p_y p1 + p_y p2) / 2
         in strokePath $ moveTo' (p_x p1) y <> lineTo' (p_x p2) y
 
+-- | Obtain the bin dimensions of a given @PlotHist@.
 histToBins :: (RealFrac x, Num y, Ord y) => PlotHist x y -> [((x,x), y)]
 histToBins hist =
     filter_zeros $ zip bounds $ counts